Sewing machine



1941- G. A. FLECKENSTEIN SEWING MACHINE Filed Sept. 28, 1939 4 Sheets-Sheet l JWNI L GEORGE A. FLEG'KENSTE/N Nov. 11, 1941. G. A. FLECKENSTEIN SEWING MACHINE Filed Sept. 28, 1959 4 Sheets-Sheet 2 G'EORGE A. FLECKE/VSTE/N N 11, 1941- G. A. FLECKENSTEIN 2,262,137

SEWING MACHINE Filed Sept. 28, 1939 4 Sheets-Sheet I5 gwua/wtom GEORGE A. FLECKENSTE/N 1941- G. A. FLECKENSTEIN SEWING MACHINE Filed Sept. 28, 1939 4 Sheets-Sheet 4 FIG. 4

GEORGE A. FL ECKENS'TEIN This invention relates to sewing Pat ented Nov. 11, 1941 PATENT OFFICE 2,262,137 SEWING mom George A. Fleckenstein, Stratford, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application September 28, 1939, No. 296,872

Claims.

machines more particularly of the small portable electrically driven family type havinga box bed in between the motor pulley and the hand-wheel on "the main-shaft andwhich will efiect the interconnection of the top or needle-bar driving shaft, the rotary hook driving shaft and the work-feed driving shaft so that they will all run at the proper relative speeds. 7 i5 with the above and other objects in'view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings, Fig. l is a longitudinal vertical section through a sewing machine embodying the invention. Fig. 2 is a bottom plan view of the bed of the machine and the mechanism contained therein. Fig. 3 is a transverse vertical section through the machine bed, with the bracket-arm head in end elevation. Fig. 4 is a transverse vertical section on the line 4-4, Fig. 2, and Fig. 5 is a transverse vertical section on the line 5--5, Fig. 2.

The machine frame comprises the box bed I and overhanging gooseneck 2 terminating in the head 3. The openbottom of the box bed i is closed by the bottom board 4 screwed thereto. The head 3 of the gooseneck 2 carries the reciprocatory needle-bar 5 and spring-pressed presser-bar 6 fitted, respectively, with theneedle 1 and presser-foot 8. A needle-thread take-up lever 9 is also mounted in the head 3 and driven, with the needle-bar 5 in the usual manner by the top rotary shaft Iii running in the horizontal or overhanging portion of the gooseneck 2. The shaft III has fixed thereto near its rearward end the huh I I of the spiral gear [2. Meshing with the gear I2 is a companion gear l3 fixed to th vertical shaft l4 Journaled in thebracket- 5 piece l5 which is formed at its upper end with spaced arms l6, Fig. 1, straddling the gear l2 and aperturedto fit upon and hang' from the top-shaft I0. At its lower end the bracketpiece I5 is fixed by the screw 11, Fig. 1, to the end face ll of the internal bed-boss {3. Fixed to the lower end of the vertical shaft H is the spiral gear 20 meshing with the spiral gear 2| onthe main-shaft 22 which is iournaled high in the bed I and has an outboard projection on which the hand-wheel and belt-pulley 23 are fixed The gear reductions are such that the top shaft makes one revolution for one and onehalf revolutions of the vertical shaft ll and two revolutions of the main shaft 22. The main shaft pulley 23 is connected by the long belt 2| to the pulley 25 of the motor 26.

It will be observed that the top shaft I3 is set forwardly of the vertical shaft ll. while the bottom shaft 22 is set rearwardly of the shaft ll. By this arrangement the vertical shaft II and top shaft in are both housed within the hollow gooseneck 2 and driven from the main shaft 22 which is set well to the ,rear of the box bed i and a. considerable distance from the motor 26, thus affording a desirably long belt-drive 24 while retaining the gooseneck 2 close to a longitudinal central vertical plane through the box bed 1. Also, by arranging to operate the main shaft 22 at twice the speed of the needlebar operating shaft ill, or at twice stitching speed, a small high speed motor 26 may be used without an inordinately large main shaft pulley 23.

Cooperating with the needle I in the formationflof stitches is the rotary hook 21 on the vertlcal shaft 28 journaled in the bottom boss 29 of the internal bed cup 30 which houses the rotary hook 21; the top of said cup being closed by the bed slide plate 30' flush with the throatplate 30". The vertical hook-shaft 28 carries the spiral gear 3| which meshes with the spiral gear 32 on the horizontal feed-shaft 33 .journaled in the internal bearing bosses 3|, 35 in the bed I. The hook cup 2'! contains the usual bobbin and stationary bobbin-thread-case which are not shown. The gearing ratio of the gears 3|, 32 is two-to-one so that the hook-shaft 28 runs at twice the speed of the feed-shaft 33, which is driven at stitching speed by the pinion 36 on the main shaft 22. The teeth of the pinion 36 are out on a slant complemental to the slanting teeth of the spirally cut gear 32, so as to mesh with the latter. Thus, there is provided an intermediate gear 32 driven by a spur-gear 33 on a parallel axis and driving a spiral gear 3| on an axis at right angles to the axis of the intermediate gear. This arrangement runs quietly and saves additional gearing which would other- 7 its other end to the wise be required to obtain the required shaft speeds of the under bed mechanisms. is

2. A sewing machine having a bed and a gooseneck including an overhanging member, a

The feeding mechanism comprises the feeda dog 31 on the feed-bar 38 fulcrumed at its forward end at 39 on the feed-rocker 40 which rocks on the pin 4| fixed horizontally in the internal bed-lug 42. The feed-bar 38 is horizontally slotted as usual to embrace the feed-lift eccentric 43 onthe feed-shaft 33 from which eccentric the feed-bar derives the rising and falling movements common to four-motion workfeeding mechanisms of sewing machines.

The feed-and-return movements of the feedbar 38are derived from the feedreccentric 44 on the feed-shaft 53. The feed-eccentric 44 is embraced by and rocks the yoke 45 having a horizontal fulcrum-shaft 46 journaled in the bedlug 41 and carrying a guide-pin 48 the axis of which intersects the axis of the fulcrum-shaft 46, as shown in Fig. 5. On the guide-pin 48 slides a cross-pin 49 which is journaled in the forked end of a link 50 pivotally connected at pin 39 carried by the feedrocker 40.

The link 50 is connected by the link to the feed-regulating lever 52 frictionally fulcrumed on the pin 53 fixed in the bed-lug 54 and having a knob 55 on its free end which extends butof top shaft journaled in the overhanging member of said gooseneck, a bottom-shaft in said bed parallel to said top shaft but offset to one side of the vertical plane containing the axis of said top shaft, and a vertical shaft disposed between the vertical planes of the top and offset bottom shafts and geared to each of said shafts, a beltpulley'on the offset bottom shaft, an electric motor disposed in said bed with its power shaft the box bed I through the slot 56, Fig. 5. By

shifting the pin 49 along the pin 48 toward the fulcrum-axis 46, the stitch length will be shortened, being zero when the pin 49 is coaxial with the fulcrum-axis 45. By shifting the pin 49 across the fulcrum-axis 46,-the direction of feed will be reversed, as will be-readily understood by those skilled inthe art.

It, will be observed that the under bed mechanism of the present machine is composed of'but few parts simply related-for the efficient cooperation of the several component parts and devices.

Having thus set forth the nature of the invention, what I claim herein is:

1. A sewing machine having a bed and a gooseneck including an overhanging member, a top shaft journaled in the overhanging member of said gooseneck, a .bottom shaft in said bed parallel to said top shaft but offset to one side of the vertical plane containing the axis of ,said top shaft, and a vertical shaft disposed in said gooseneck between the vertical planes of the top and offset bottom shafts and geared to each of said shafts.

ofiset from the vertical plane of the top shaft in the opposite direction from said offset bottom shaft, and a belt connection between said motor and belt-pulley.

3. A sewing machine having a box bed and overhanging gooseneck, a reciprocatory needle carried by said gooseneck, a vertical axis rotary hook complemental to said needle, a vertical hook-shaft in said bed, feeding mechanism in said bedand including a horizontal feed driving shaft disposed rearwardly of the vertical hookshaft, intermeshing spiral gears on said feedand hook-shafts, a main shaft disposed in said bed rearwardly of said feed-shaft and above the level of the feed-shaft, and a gear on the mainshaft meshing with the gear on the feed-shaft.

4. A sewing machine having a box bed and overhanginggooseneck, a motor-driven mainshaft journaled in said bed, well to the rear thereof, a needle-.bar-operating shaft in said gooseneck, a feed-shaft and rotary hook shaft in said bed, a vertical shaft in said gooseneck connecting the main and needle-bar-operating shafts, driving connections between the main shaft and feedand hook-shafts, all of said shafts exclusive of the main-shaft being disposed forwardly of a vertical plane containing the main-shaft, and an electric motor in said bed connected to drive the main shaft. v

5. A sewing machine having a bed and overhanging hollow gooseneck, a top shaft journaled horizontally in said gooseneck, a bottom shaft journaled horizontally in said bed, a bracketpiece disposed in the upright part of said gooseneck and apertured to receive and hang from the top shaft, an upright shaft journaled in' 

